By employing a readily available CuCl/DDQ catalyst system, we herein report a directC(sp3)–Hsulfonylation of xanthene derivates with odorless sodium sulfinates. Various 9H-xanthenes, thioxanthenes, and 9,10-dihydroacridines are efficiently transformed into the desired benzylic sulfonyl products via a radical/radical cross-coupling process, proceeding with the merits of broad substrate scope, operational
New gas phase reactions of substituted benzyl, phenylaminyl, and phenoxyl radicals. Rearrangements to fused 5- and 6-membered heterocyclic systems
作者:J. I. G. Cadogan、Clare L. Hickson、H. Susan Hutchison、Hamish McNab
DOI:10.1039/c39850000643
日期:——
Flash vacuum pyrolysis studies of substitutedbenzyl, phenylaminyl, and phenoxylradicals have revealed three new classes of reactions: formation of five-membered ring products via intramolecular abstraction of an aromatic hydrogen atom, formation of six-membered rings via spirodienyl radical intermediates, and isomerisation of o-phenoxybenzyl into o-benzylphenoxyl radicals and vice versa.
Electrochemically Mediated Direct C(
<i>sp</i>
<sup>3</sup>
)−H Sulfonylation of Xanthene Derivatives
作者:Wan‐Jie Wei、Yu‐Jing Zhong、Yu‐Feng Feng、Lei Gao、Hai‐Tao Tang、Ying‐Ming Pan、Xian‐Li Ma、Zu‐Yu Mo
DOI:10.1002/adsc.202101289
日期:2022.2.15
The construction of C(sp3)-sulfonyl bonds through directsulfonylation of C(sp3)−H bond presents a number of challenges, so an electrochemical oxidation-induced directsulfonylation of the xantheneC(sp3)−H bond was developed. Significant advantages of this method are high atom efficiency, functional group tolerance, transition metal- and oxidant-free conditions. The in vitro cytotoxicity of all product
Photocatalytic C(sp3)–H phosphorylation of xanthenes and 9,10-dihydroacridines with P(O)–Hcompounds under the irradiation of 18 W blue LEDs at room temperature using fluorescein as the photocatalyst and molecular oxygen (O2) as the sole oxidant has been achieved. The newly developed reaction provides direct access to 9-phosphorylated xanthene derivatives with good functional group compatibility.
以荧光素为光催化剂,分子氧 (O 2 ) 为光催化剂,室温下 18 W 蓝光 LED 照射下,氧杂蒽和 9,10-二氢吖啶与 P(O)-H 化合物的光催化 C(sp 3 )–H磷酸化已实现唯一氧化剂。新开发的反应可以直接获得具有良好官能团相容性的9-磷酸化呫吨衍生物。